introduce more pythonic way to install vidsum

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Fixes issue: #[Mention the issue number it fixes or add the details of the changes if it doesn't has a specific issue.]

This merge request introduce best practices about how to install properly python package.

This merge request can be following by an other merge request for deploy vidsum on pypi and users can install it from pypi pip install vidsum.

Changes: [Add here what changes were made in this pull request.]

• introduce setuptools for install package like a standard python package
• introduce pbr for generate automaticaly release based on git tags and manage a more properly semver
• update the documentation for using these features
• rename files and directory for respect python best practices conventions (init, etc...)

[4383]

Hi @AdiChat! Can you review please?